Method of manufacturing magnetic field shielding sheet and magnetic field shielding sheet formed thereby

Abstract

Disclosed is a method of manufacturing a magnetic field shielding sheet. The method of manufacturing a magnetic field shielding sheet formed as a plurality of divided pieces includes preparing a magnetic sheet formed of a magnetic material and having a first area and punching the magnetic sheet to form a shielding sheet using a mold such that the shielding sheet having a second area which is narrower than the first area is separated from the magnetic sheet, wherein the punching of the magnetic sheet to form the shielding sheet includes forming at least one linear slit in an inner region of the second area using the mold such that the shielding sheet is divided into a plurality of pieces while the shielding sheet is separated from the magnetic sheet to have the second area.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation-in-part of U.S. application Ser. No. 15 / 745,444, filed Jan. 17, 2018, which is a national phase application under 35 U.S.C. § 371 of International Application No. PCT / KR2016 / 007680, filed Jul. 14, 2016, which claims priority to Korean Patent Application No. 10-2015-0102524, filed Jul. 20, 2015. The contents of the referenced patent applications are incorporated into the present application by reference.BACKGROUND1. Technical Field[0002]The present disclosure relates to a magnetic field shielding, and more particularly, to a magnetic field shielding unit that shields a magnetic field to prevent external leakage and condense the magnetic field in a desired direction.2. Discussion of the Related Art[0003]Recently, a portable terminal has a wireless charging function for wirelessly charging a built-in battery. The wireless charging can be performed by a wireless power receiving module built in the portable te...

AI Technical Summary

Benefits of technology

[0018]To solve the above problem and defects, it is an object of the present disclosure to provide a magnetic field shielding unit of which protective film to be attached to an exposed surface of a shielding sheet is replaced with a metallic material so that the shielding sheet can have an increased rigidity due to the metallic protective film itself and thus effectively prevent a damage by an external impact, thereby enhancing a protecting function against an external environment.

[0019]In addition, it is another object of present disclosure to provide the magnetic field shielding unit which can enhance a heat radiating performance of the wireless power transfer module by adding a heat radiating function and a protective function by replacing a protective film of the shielding sheet to attached to a surface of the shielding sheet with a metallic thin film having thermal conductivity.

Problems solved by technology

However, the conventional protective film cannot satisfactorily perform a function as a protective film because strength of the raw material for the protective film is so weak that it may be torn or scratched easily by an external impact.

Accordingly, since the additional flaking process is added in order to divide the magnetic field shielding sheet into the pieces, there is a problem in that a production cost increases due to an additional process in the manufacturing process.

In addition, in the flaking process performed by the pair of rollers, since the whole area of the magnetic field shielding sheet is pressed while passing between the pair of rollers, there is a problem in adjusting sizes of the pieces.

Accordingly, it is difficult to produce the magnetic field shielding sheet having various permeabilities through the conventional flaking process.

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